Both President George W. Bush and his challenger John Kerry spent their Sunday campaigning in battleground states, making their last efforts to woo voters still undecided and calling supporters to cast ballots on Tuesday.

Both the two candidates tried to turn Osama bin Laden's video address broadcast on Friday to their political advantage, with Kerry trying to remind voters that the president failed to capture bin Laden believed to have launched the Sept. 11, 2001, strikes, and Bush accusing Kerry of opportunism.

"If you believe America should fight the war on terror with all our might and lead with unwavering confidence in our ideals, I ask you to come stand with me," he said in Tampa, Florida.

Earlier in the day, Bush said at a rally in Miami that he would "keep the pressure on" Cuba, in an effort to win votes from Cuban Americans. "Over the next four years, we will continue to press hard and ensure that the gift of freedom finally reaches the men and women of Cuba," he said.

At campaign rallies later in the day, Bush attacked Kerry as certain to raise taxes and fickle on national security issues.

Bush spent most of the day in Florida, a state with 27 electoral votes that decided the disputed 2000 election, before flying to Ohio for an evening rally in Cincinnati.

On Monday, Bush was to campaign in Ohio, Pennsylvania, Wisconsin, Iowa, New Mexico, Texas.

Kerry campaigned in Ohio, New Hampshire and Florida on Sunday.

In an interview with ABC television, Kerry said that "I'm going to hunt down, capture and kill the terrorists, and I believe I will wage a far more effective war on terror than George Bush has, " Kerry said.

Kerry was to stump in Michigan, Ohio and Wisconsin on Monday.

A number of opinion polls released Sunday suggested the presidential race for the popular vote was essentially tied.

Four polls found the contest a dead heat ahead of Tuesday's ballot and four others gave the president a statistically insignificant lead of one to three percentage points.